EP2124082A1 - Vibrationsbeständiges Telezoomobjektiv mit fünf Linsengruppen vom Hinterfokus-Typ - Google Patents

Vibrationsbeständiges Telezoomobjektiv mit fünf Linsengruppen vom Hinterfokus-Typ Download PDF

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Publication number
EP2124082A1
EP2124082A1 EP09159887A EP09159887A EP2124082A1 EP 2124082 A1 EP2124082 A1 EP 2124082A1 EP 09159887 A EP09159887 A EP 09159887A EP 09159887 A EP09159887 A EP 09159887A EP 2124082 A1 EP2124082 A1 EP 2124082A1
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Prior art keywords
lens unit
lens
zoom
zoom lens
wide
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Granted
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EP09159887A
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English (en)
French (fr)
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EP2124082B1 (de
Inventor
Yasuaki Hagiwara
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Canon Inc
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Canon Inc
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
    • G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
    • G02B15/145121—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+-+

Definitions

  • the present invention relates to zoom lenses and image pickup apparatuses including the zoom lenses, and more particularly, to a zoom lens suitable for use in a still camera, a video camera, a digital still camera, a surveillance camera, etc., and an image pickup apparatus including the zoom lens.
  • U.S. Patent No. 7,177,092 discusses a wide-field-angle zoom lens having a high zoom ratio (about 10) from a wide-angle range to a telephoto range.
  • Japanese Patent Laid-Open No. 2007-47538 discusses a small zoom lens having a high zoom ratio (about 10) from a wide-angle range to a telephoto range.
  • the field angle 2 ⁇ at the wide angle end is 76° and the zoom ratio is about 10.
  • the zoom ratio is about 10.
  • the overall lens length at the telephoto end is relatively large.
  • a small zoom lens with a high zoom ratio of about 10 is provided.
  • a large image-plane variation occurs in a meridional cross section during zooming from the wide-angle end to the telephoto end.
  • the present invention provides a small, high-zoom-ratio zoom lens having high optical performance and a large field angle at the wide-angle end, and an image pickup apparatus including the zoom lens.
  • the present invention in its first aspect provides a zoom lens as specified in claims 1 to 8.
  • the present invention in its second aspect provides an image pickup apparatus as specified in claim 9.
  • Fig. 1 is a sectional view of a zoom lens according to a first numerical example of the present invention at the wide-angle end.
  • Figs. 2A to 2C illustrate aberration diagrams of the zoom lens according to the first numerical example of the present invention.
  • Fig. 3 is a sectional view of a zoom lens according to a second numerical example of the present invention at the wide-angle end.
  • Figs. 4A to 4C illustrate aberration diagrams of the zoom lens according to the second numerical example of the present invention.
  • Fig. 5 is a sectional view of a zoom lens according to a third numerical example of the present invention at the wide-angle end.
  • Figs. 6A to 6C illustrate aberration diagrams of the zoom lens according to the third numerical example of the present invention.
  • Fig. 7 is a sectional view of a zoom lens according to a fourth numerical example of the present invention at the wide-angle end.
  • Figs. 8A to 8C illustrate aberration diagrams of the zoom lens according to the fourth numerical example of the present invention.
  • Fig. 9 is a sectional view of a zoom lens according to a fifth numerical example of the present invention at the wide-angle end.
  • Figs. 10A to 10C illustrate aberration diagrams of the zoom lens according to the fifth numerical example of the present invention.
  • Fig. 11 is a sectional view of a zoom lens according to a sixth numerical example of the present invention at the wide-angle end.
  • Figs. 12A to 12C illustrate aberration diagrams of the zoom lens according to the sixth numerical example of the present invention.
  • Fig. 13 is a sectional view of a zoom lens according to a seventh numerical example of the present invention at the wide-angle end.
  • Figs. 14A to 14C illustrate aberration diagrams of the zoom lens according to the seventh numerical example of the present invention.
  • Fig. 15 is a schematic diagram illustrating the main part of an image-pickup apparatus according to an embodiment of a present invention.
  • Each of the zoom lenses according to the embodiments of the present invention includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power in order from the object side to the image side.
  • all of the lens units move during zooming from the wide-angle end to the telephoto end. More specifically, the lens units move such that the distance between the first and second lens units L1 and L2 at the telephoto end is larger than that at the wide-angle end and the distance between the third and fifth lens units L3 and L5 at the telephoto end is larger than that at the wide-angle end.
  • the zoom ratio can be increased and the size can be reduced at the same time.
  • the magnification is changed by increasing the distance between the first lens unit L1 and the second lens unit L2.
  • the third lens unit L3 is also moved during zooming, so that the entrance pupil can be moved to a suitable position at the telephoto end. Accordingly, the lens diameter can be reduced.
  • the third lens unit L3 Since the third lens unit L3 is moved, the third lens unit L3 also contributes to the function of changing the magnification provided by the first lens unit L1 and the second lens unit L2. Therefore, the amounts of movement of the first lens unit L1 and the second lens unit L2 for changing the magnification can be reduced. As a result, the overall lens length (distance between the lens surface closest to the object side in the first lens unit L1 and an image plane IP along an optical axis) at the telephoto end can be reduced.
  • a high zoom ratio can be obtained by increasing the distance between the third lens unit L3 and the fifth lens unit L5 during zooming from the wide-angle end to the telephoto end.
  • Conditional Expression (1) relates to the ratio between the refractive powers of the fourth and fifth lens units L4 and L5 with respect to the zoom ratio Z in the zooming operation.
  • the fourth lens unit and the fifth lens unit are moved during zooming.
  • the zoom ratio can be increased, the optical performance can be improved, and the size can be reduced at the same time by adequately setting the refractive powers of the fourth and fifth lens units.
  • Conditional Expression (1) If the value of Conditional Expression (1) is less than the lower limit thereof, a large image-plane variation occurs in the wide-angle range and it is difficult to maintain high optical performance. In addition, the amount of movement of the fourth lens unit L4 increases, and therefore it is difficult to reduce the size of the system.
  • Conditional Expression (1) If the value of Conditional Expression (1) is greater than the upper limit thereof, a large image-plane variation occurs in the telephoto range. In addition, if the amount of movement of the fifth lens unit L5 is increased to obtain a high zoom ratio, it is difficult to reduce the size of the entire system.
  • Fig. 1 is a sectional view of a zoom lens according to a first numerical example of the present invention at the wide-angle end (short-focal-length end).
  • Figs. 2A to 2C illustrate aberration diagrams of the zoom lens according to the first numerical example of the present invention.
  • Fig. 3 is a sectional view of a zoom lens according to a second numerical example of the present invention at the wide-angle end.
  • Figs. 4A to 4C illustrate aberration diagrams of the zoom lens according to the second numerical example of the present invention.
  • Fig. 5 is a sectional view of a zoom lens according to a third numerical example of the present invention at the wide-angle end.
  • Figs. 6A to 6C illustrate aberration diagrams of the zoom lens according to the third numerical example of the present invention.
  • Fig. 7 is a sectional view of a zoom lens according to a fourth numerical example of the present invention at the wide-angle end.
  • Figs. 8A to 8C illustrate aberration diagrams of the zoom lens according to the fourth numerical example of the present invention.
  • Fig. 9 is a sectional view of a zoom lens according to a fifth numerical example of the present invention at the wide-angle end.
  • Figs. 10A to 10C illustrate aberration diagrams of the zoom lens according to the fifth numerical example of the present invention.
  • Fig. 11 is a sectional view of a zoom lens according to a sixth numerical example of the present invention at the wide-angle end.
  • Figs. 12A to 12C illustrate aberration diagrams of the zoom lens according to the sixth numerical example of the present invention.
  • Fig. 13 is a sectional view of a zoom lens according to a seventh numerical example of the present invention at the wide-angle end.
  • Figs. 14A to 14C illustrate aberration diagrams of the zoom lens according to the seventh numerical example of the present invention.
  • Fig. 15 is a schematic diagram illustrating the main part of an image-pickup apparatus according to an embodiment of a present invention.
  • the zoom lens according to each example is an imaging lens system used in an image pickup apparatus, such as a video camera, a digital camera, or a silver-halide film camera.
  • an image pickup apparatus such as a video camera, a digital camera, or a silver-halide film camera.
  • the left side shows the object side (front) and the right side shows the image side (rear).
  • each zoom lens includes a first lens unit L1 having a positive refractive power (optical power is the reciprocal of focal length), a second lens unit L2 having a negative refractive power, a third lens unit L3 having a positive refractive power, a fourth lens unit L4 having a negative refractive power, and a fifth lens unit L5 having a positive refractive power.
  • SP denotes an F-number determining member (hereinafter referred to also as an "aperture stop") that serves as an aperture stop which determines (restricts) the open F-number (Fno) luminous flux.
  • aperture stop an F-number determining member that serves as an aperture stop which determines (restricts) the open F-number (Fno) luminous flux.
  • IP denotes an image plane.
  • an image pickup plane of a solid-state image pickup element such as a CCD sensor or a CMOS sensor
  • a photosensitive surface which corresponds to a film surface, is positioned at the image plane IP.
  • the solid line and the dot-dot dash line are d-line and g-line, respectively.
  • the d-line is used as the reference, and the solid line and the dot-dot dash line correspond to a sagittal image plane and an area meridional image plane, respectively.
  • the d-line and the g-line, respectively are used as the reference.
  • Fno denotes the F-number
  • ⁇ denotes a half field angle
  • h denotes an image height.
  • the wide-angle end and the telephoto end are zooming positions corresponding to the states in which the magnification-varying lens unit is at one and other ends of a mechanically moveable range along an optical axis.
  • the first lens unit L1 moves toward the object side
  • the second lens unit L2 moves toward the image side
  • the third lens unit L3 moves toward the object side
  • the fourth lens unit L4 moves along a locus that is convex toward the object side
  • the fifth lens unit L5 moves toward the image side.
  • the first lens unit L1 includes a cemented lens including a negative meniscus lens having a convex surface on the image side and a positive lens, and a positive meniscus lens having a convex surface on the object side in order from the object side to the image side.
  • the second lens unit L2 includes a negative meniscus lens having a concave surface on the image side, a biconcave negative lens, and a positive meniscus lens having a convex surface on the object side in order from the object side to the image side.
  • the second lens unit L2 includes two negative meniscus lenses having a concave surface on the image side, a negative meniscus lens having a concave surface on the object side, and a positive lens having a convex surface on the object side in order from the object side to the image side.
  • the diameter of the front can be reduced and the variation in chromatic aberration during zooming can be reduced at the same time.
  • variation in the field curvature and the spherical aberration at the telephoto end can be adequately corrected.
  • the astigmatism and distortion can be adequately corrected at the wide-angle end.
  • the third lens unit L3 includes a biconvex positive lens, a negative meniscus lens having a concave surface on the image side, and a biconvex positive lens in order from the object side to the image side.
  • the third lens unit L3 includes a biconvex positive lens, a negative meniscus lens having a concave surface on the image side, and a cemented lens including a negative meniscus lens having a concave surface on the image side and a biconvex positive lens in order from the object side to the image side.
  • the third lens unit L3 includes one or more positive lenses including a positive lens disposed at a position closest to the object side and one or more negative lenses. At least one of the positive lenses included in the third lens unit L3 is an aspherical lens. According to this structure, the spherical aberration and the field curvature can be adequately corrected.
  • the fourth lens unit L4 is constituted of a single negative lens, a cemented lens including two negative lenses, or a cemented lens including a positive lens and a negative lens.
  • the fifth lens unit L5 is constituted of a positive lens having a convex surface on the image side or a cemented lens including a biconvex positive lens and a negative meniscus lens having a concave surface on the object side.
  • Focusing can be performed by moving the fourth lens unit L4 or the fifth lens unit L5 along the optical axis of the zoom lens. In such a case, variation in aberrations during focusing can be suppressed to a relatively low level.
  • the imaging position can be changed by moving a part or the entire body of the third lens unit in a direction having a component that is perpendicular to the optical axis of the zoom lens.
  • variation in eccentric aberration (aberration due to eccentricity) can be suppressed to a relatively low level.
  • the ratio between the refractive powers of the fourth and fifth lens unit L4 and L5 with respect to the zoom ratio Z is adequately set so as to satisfy Conditional Expression (1). Accordingly, a small, high-zoom-ratio zoom lens having high optical performance and a large field angle at the wide-angle end is provided.
  • f2 is a focal length of the second lens unit L2 and f5 is a focal length of the fifth lens unit L5, one or both of the following conditions can be satisfied: 0.01 ⁇ f ⁇ 2 / ft ⁇ 0.20 0.10 ⁇ f ⁇ 5 / f ⁇ 2 / Z ⁇ 0.25
  • Conditional Expression (2) relates to a numerical range of the ratio of the focal length f2 of the second lens unit L2 to the focal length ft of the entire system at the telephoto end.
  • Conditional Expression (2) If the value of Conditional Expression (2) is less than the lower limit thereof, the refractive power of the second lens unit L2 is too high and large amounts of aberrations are generated at the second lens unit L2. In particular, large amounts of field curvature and astigmatism are generated. Therefore, the number of lenses must be increased or an aspherical surface must be added to correct the aberrations; this is disadvantageous from the viewpoint of manufacturing costs.
  • Conditional Expression (2) if the value of Conditional Expression (2) is greater than the upper limit thereof, the aberrations can be effectively corrected. However, the second lens unit L2 must be moved by a large distance in the magnification-varying process, and the overall lens length is increased accordingly.
  • Conditional Expression (3) relates to a numerical range of the ratio between the focal lengths of the second and fifth lens units L2 and L5 with respect to the ratio between the focal lengths of the overall system at the wide-angle end and the telephoto end.
  • Conditional Expression (3) If the value of Conditional Expression (3) is less than the lower limit thereof, the magnification-varying effect obtained by the second lens unit L2 is too low. Therefore, the second lens unit L2 must be moved by a large distance in the magnification-varying process, and the overall lens length is increased accordingly.
  • the refractive power of the fifth lens unit L5 is too high and large amounts of aberrations are generated at the fifth lens unit L5. In particular, large amounts of field curvature and astigmatism are generated.
  • Conditional Expression (3) is greater than the upper limit thereof, the refractive power of the second lens unit L2 is too high and large amounts of aberrations are generated at the second lens unit L2. In particular, large amounts of field curvature and astigmatism are generated.
  • Z is the zoom ratio (ft/fw) .
  • the Conditional Expression (4) relates to the magnification-varying effect which is provided by the third lens unit L3.
  • Conditional Expression (4) If the value of Conditional Expression (4) is less than the lower limit thereof, the magnification-varying effect of the third lens unit L3 is low and it is necessary to increase the refractive power of the second lens unit L2. Therefore, it is difficult to suppress the image-plane variation during zooming.
  • Conditional Expression (4) is greater than the upper limit thereof, the size of the entire system can be effectively reduced. However, large amounts of field curvature and astigmatism are generated.
  • the Conditional Expression (5) relates to the magnification-varying effect which is provided by the fifth lens unit L5.
  • Conditional Expression (5) If the value of Conditional Expression (5) is less than the lower limit thereof, the magnification-varying effect of the fifth lens unit L5 is low. Therefore, the fifth lens unit L5 is to be moved by a large distance during zooming from the wide-angle end to the telephoto end, and it is difficult to reduce the size of the entire system.
  • Conditional Expression (5) is greater than the upper limit thereof, the size of the overall system can be effectively reduced. However, large amounts of field curvature and astigmatism are generated.
  • the zoom lenses according to the first to seventh examples satisfy all of the above-described Conditional Expressions (2) to (5). However, it is not necessary that all of the conditional expressions be satisfied at the same time. The above-described effects can be individually obtained by satisfying the corresponding conditional expressions.
  • a camera body 20 includes an imaging optical system 21 including the zoom lens according to at least one of the first to seventh examples.
  • a solid-state image pickup element (photoelectric conversion element) 22 such as a CCD sensor and a CMOS sensor, for receiving an object image formed by the imaging optical system 21 is disposed in the camera body 20.
  • a memory 23 records information corresponding to the object image that is subjected to photoelectric conversion performed by the solid-state image pickup device 22.
  • a finder 24 is formed of, for example, a liquid crystal display panel or the like and allows a user to observe the object image formed on the image-pickup element 22.
  • the zoom lens according to at least one of the examples of the present invention is included in an image pickup apparatus, such as the digital still camera, a small image pickup apparatus which provides high optical performance can be obtained.
  • i denotes the number counted from the object side
  • ri denotes the radius of curvature of the i th surface from the object side
  • di denotes the lens thickness or air distance for the i th surface from the object side
  • ni and ⁇ i respectively denote the refractive index and the Abbe number of the i th material from the object side.
  • BF denotes the back focus.
  • Table 1 shows the relationship between Conditional Expressions (1) to (5) and the first to seventh numerical examples.
  • Zoom Lens Unit Data Unit No. First Surface Focal Length 1 1 67.95 2 6 -9.82 3 15 19.83 4 22 -41.62 5 25 19.97
  • Zoom Lens Unit Data Unit No. First Surface Focal Length 1 1 69.78 2 6 -9.86 3 15 19.13 4 22 -42.07 5 25 20.35
  • Zoom Lens Unit Data Unit No. First Surface Focal Length 1 1 55.06 2 6 -8.10 3 13 14.16 4 19 -27.14 5 22 18.21
  • Zoom Lens Unit Data Unit No. First Surface Focal Length 1 1 47.27 2 6 -7.59 3 12 11.20 4 19 -14.41 5 21 15.53
  • Zoom Lens Unit Data Unit No. First Surface Focal Length 1 1 41.85 2 6 -6.64 3 12 8.39 4 19 -10.74 5 21 15.61
  • Zoom Lens Unit Data Unit No. First Surface Focal Length 1 1 43.62 2 6 -6.80 3 12 7.99 4 19 -10.24 5 21 14.78 Table 1 1st Example 2nd Example 3rd Example 4th Example 5th Example 6th Example 7th Example fw 4.3361 4.7887 5.3778 5.1500 6.0000 5.1464 4.8081 ft 42.4224 92.8917 52.6868 99.9934 99.9796 50.3563 47.1390 Z 9.7836 19.3987 9.7971 19.4162 16.6633 9.7847 9.8042 f1 44.7096 67.9484 47.2742 69.7822 55.0589 41.8519 43.6197 f2 -6.6526 -9.8189 -7.5912 -9.8590 -8.1042 -6.6429 -6.7958 f3 8.2188 19.8268 11.2009 19.1318 14.1640 8.3862 7.9943 f4 -10.0689 -41.6162 -14.4066 -42
  • a zoom lens includes a first lens unit (L1) having a positive refractive power, a second lens unit (L2) having a negative refractive power, a third lens unit (L3) having a positive refractive power, a fourth lens unit (L4) having a negative refractive power, and a fifth lens unit (L5) having a positive refractive power.
  • the first to fifth lens units are arranged in order from the object side to the image side.
  • All of the lens units are moved during zooming from the wide-angle end to the telephoto end such that the distance between the first lens unit and the second lens unit is increased and the distance between the third lens unit and the fifth lens unit is increased.
  • the refractive power of the fourth lens unit and the refractive power of the fifth lens unit are adequately set with respect to the zoom ratio.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
EP09159887A 2008-05-23 2009-05-11 Vibrationsbeständiges Telezoomobjektiv mit fünf Linsengruppen vom Hinterfokus-Typ Not-in-force EP2124082B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008135687A JP4869288B2 (ja) 2008-05-23 2008-05-23 ズームレンズ及びそれを有する撮像装置

Publications (2)

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EP2124082A1 true EP2124082A1 (de) 2009-11-25
EP2124082B1 EP2124082B1 (de) 2011-11-09

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US (1) US7830612B2 (de)
EP (1) EP2124082B1 (de)
JP (1) JP4869288B2 (de)
CN (1) CN101587233B (de)
AT (1) ATE533078T1 (de)

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KR102013241B1 (ko) 2012-12-28 2019-08-22 삼성전자주식회사 줌 렌즈 및 이를 포함한 촬영 장치
WO2014115470A1 (ja) * 2013-01-25 2014-07-31 コニカミノルタ株式会社 ズームレンズ及び撮像装置
JP6076764B2 (ja) 2013-02-05 2017-02-08 株式会社タムロン ズームレンズ
JP2014178478A (ja) * 2013-03-14 2014-09-25 Olympus Imaging Corp ズームレンズ及びそれを有する撮像装置
JP6214205B2 (ja) 2013-05-10 2017-10-18 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
JP6136588B2 (ja) * 2013-05-31 2017-05-31 ソニー株式会社 ズームレンズ及び撮像装置
WO2014203572A1 (ja) * 2013-06-21 2014-12-24 オリンパス株式会社 ズームレンズ及びそれを有する撮像装置
KR102094508B1 (ko) 2013-12-11 2020-03-27 삼성전자주식회사 줌 렌즈 및 이를 포함한 촬영 장치
WO2016157340A1 (ja) 2015-03-27 2016-10-06 オリンパス株式会社 ズームレンズ及びそれを備えた撮像装置
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JP6647038B2 (ja) * 2015-12-24 2020-02-14 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
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ATE533078T1 (de) 2011-11-15
US20090290232A1 (en) 2009-11-26
JP2009282398A (ja) 2009-12-03
CN101587233A (zh) 2009-11-25
US7830612B2 (en) 2010-11-09
CN101587233B (zh) 2010-11-10
JP4869288B2 (ja) 2012-02-08
EP2124082B1 (de) 2011-11-09

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